#!/usr/bin/python

###################################################
#                                                 #
# Removes every other line if that line is blank. #
#                                                 #
###################################################

import sys

def main() :

	previous_line_printed = 1

	while 1 :

		line = sys.stdin.readline()

		if not line :
			break
		elif ( line == '\n' ) and previous_line_printed :
			# We have encountered an unwanted blank line
			previous_line_printed = 0       # Because we're not printing this line
		else :
			print line,
			previous_line_printed = 1



if __name__ == '__main__' :
	main()